Title of article :
Solid Phase Extraction of Copper, Cadmium and Lead using Amberlite XAD-4 Resin Functionalized with 2- Hydroxybenzaldehyde Thiosemicarbazone and its Application on Green Tea Leaves
Author/Authors :
Chowdhury, Didarul A. Bangladesh Atomic Energy Commission - Scientific Information Division, Bangladesh , Hoqueb, Md. Ikram ul Bangladesh University of Engineering and Technology - Department of Chemistry, Bangladesh , Fardous, Zeenath Atomic Energy Research Establishment (AERE) - Institute of Food and Radiation Biology, Bangladesh Atomic Energy Commission, Bangladesh
From page :
90
To page :
102
Abstract :
A new chelating resin, 2-hydroxybenzaldehyde thiosemicarbazone loaded XAD-4, wassynthesized and characterized by FT-IR and elemental analyses. The synthesized resin wasused for solid phase extraction (SPE) and preconcentration of Cu^2+, Cd^2+, and Pb^2+ fromaqueous solution, where the metal ions were subsequently determined by graphite furnaceatomic absorption spectrometry (GF-AAS). The optimum pH for preconcentration and separation of these metal ions was found to be 6.00. Optimum flow rate for quantitative sorption of the metal ions on functionalized resin was found to be 1 mL/min whereas 2 M nitric acid was selected as the eluent for quantitative release of the three metal ions from the resin column. The maximum adsorption capacity of the functionalized resin was found to be 3.5, 6.1, and 11.26 mg/g for Cu^2+, Cd^2+, and Pb^2+, respectively. The detection limits for these metal ions are 0.87, 0.95, and 1.09 μg/L, respectively and limits of quantification are 1.12, 1.29, and 1.16 μg/L, respectively. The sorption half time (t1/2) was found to be 6 min for Cu2+ and Cd^2+ and 8 min for Pb^2+. Tolerance limits for various foreign electrolytes have also been investigated. A high preconcentration factor (~100) and low relative standard deviation ≤ 5% (n=3) values were obtained. Under optimum conditions, recovery of all metal ions was found to be nearly quantitative. The validation of the procedure was carried out by analysis of certified reference materials. The functionalized resin is highly stable and can be reused more than 100 times. The newly developed method was applied to the separation, preconcentration and determination of Cu^2+, Cd^2+, and Pb^2+ in tea leaves collected from the tea gardens of Moulovibazar district in Bangladesh
Keywords :
SPE , Amberlite XAD , 4 , Preconcentration , Trace metals , GF , AAS.
Journal title :
Jordan Journal of Chemistry
Journal title :
Jordan Journal of Chemistry
Record number :
2585278
Link To Document :
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